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① 直接写出得数。(每题1分,共20分)
5.2+2.3=
9.7+5=
28.7+16=
5.45+2.71=
1.1+0.6=
45.7-8.9=
60×0.9=
8.56-1.38=
25.6+37.8=
25+8.6=
3.6÷10=
2.8+5=
5.1÷0.3=
7.58-1.88=
1.8+7.2=
47+34.8=
6.5×10=
2.3×0.4=
5×0.7=
4.2×3=
5.2+2.3=
9.7+5=
28.7+16=
5.45+2.71=
1.1+0.6=
45.7-8.9=
60×0.9=
8.56-1.38=
25.6+37.8=
25+8.6=
3.6÷10=
2.8+5=
5.1÷0.3=
7.58-1.88=
1.8+7.2=
47+34.8=
6.5×10=
2.3×0.4=
5×0.7=
4.2×3=
答案
7.5
14.7
44.7
8.16
1.7
36.8
54
7.18
63.4
33.6
0.36
7.8
17
5.7
9
81.8
65
0.92
3.5
12.6
14.7
44.7
8.16
1.7
36.8
54
7.18
63.4
33.6
0.36
7.8
17
5.7
9
81.8
65
0.92
3.5
12.6
② 计算。(每题3分,共18分)
$24×14.3+14.3×76$
$2.8×175-28×7.5$
$6.4+3.6×5.2$
$(2.5+0.25)×4$
$4.8×9.9$
$8×0.37×1.25$
$24×14.3+14.3×76$
$2.8×175-28×7.5$
$6.4+3.6×5.2$
$(2.5+0.25)×4$
$4.8×9.9$
$8×0.37×1.25$
答案
1430
280
25.12
11
47.52
3.7
280
25.12
11
47.52
3.7
③ 解方程。(每题4分,共12分)
$2x - 0.15 = 6.25$
$0.35 + 0.5x = 36.6$
$3(x - 2.1) = 8.4$
$2x - 0.15 = 6.25$
$0.35 + 0.5x = 36.6$
$3(x - 2.1) = 8.4$
答案
解:$x=3.2$
解:$x=72.5$
解:$x=4.9$
解:$x=72.5$
解:$x=4.9$
